Having problem for converting .png image to transparent image

I have an image named 90210257T.png and we have to make the image background transparent.
The following is the code we are using for converting image into transparent background named trans.png ,now the problem is that when we use to display in html or jsp page the lines of the image get blur.

<%!
            private static BufferedImage imageToBufferedImage(Image image) {

BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_ARGB);
            Graphics2D g2 = bufferedImage.createGraphics();
            g2.drawImage(image, 0, 0, null);
            g2.dispose();

return bufferedImage;

}

public static Image makeColorTransparent(BufferedImage im, final Color color) {
            ImageFilter filter = new RGBImageFilter() {

// the color we are looking for... Alpha bits are set to opaque
                    public int markerRGB = color.getRGB() | 0xFF000000;

public final int filterRGB(int x, int y, int rgb) {
                            if ((rgb | 0xFF000000) == markerRGB) {
                                    // Mark the alpha bits as zero - transparent
                                    return 0x00FFFFFF & rgb;
                            } else {
                                    // nothing to do
                                    return rgb;
                            }
                    }
            };

ImageProducer ip = new FilteredImageSource(im.getSource(), filter);
            return Toolkit.getDefaultToolkit().createImage(ip);
        }
  
  %>
    <%
    
     File in = new File("C:\\90210257T.png");
            BufferedImage source = ImageIO.read(in);

int color = source.getRGB(0, 0);

Image image = makeColorTransparent(source, new Color(color));

BufferedImage transparent = imageToBufferedImage(image);

File out1 = new File("C:\\trans.png");
            ImageIO.write(transparent, "png", out1); 
   %>